Add FBMacros file (#198)

Summary:
It was deleted in one of the previous commit and it broke the build
Pull Request resolved: https://github.com/facebook/flipper/pull/198

Reviewed By: passy

Differential Revision: D9117234

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 72d9d58a11683b8a51732b3f735ef1326ce56794

iOS/FBDefines/FBMacros.h

@@ -0,0 +1,14 @@
+/*	
+ *  Copyright (c) 2004-present, Facebook, Inc.	
+ *	
+ *  This source code is licensed under the MIT license found in the LICENSE	
+ *  file in the root directory of this source tree.	
+ *	
+ */	
+#ifndef FB_SK_MACROS_H	
+ #define FB_SK_MACROS_H	
+     #define FB_LINK_REQUIRE_(NAME, UNIQUE)	
+    #define FB_LINKABLE(NAME)	
+    #define FB_LINK_REQUIRE(NAME)	
+    #define FB_LINK_REQUIRE_EXT(NAME)	
+ #endif